Boxing is amazing. No other sport gets me as excited as boxing. The hours before a big fight are great.
Football (soccer) is easily the most popular sport in the world. The second largest sporting event in the world is the Football world cup followed by the rugby world cup. Number 1 is the the olympics.
Lots of american sports aren't big in other places in the world. One reason for this might be the cost. With football you only need a football. You can practice certain aspects by yourself. Other sports like American football you need lots of equipment to play safely aswell as a few people who need equipment aswell.